The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Fast Carrier Recovery for High-Order QAM Systems

고차의 QAM 시스템을 위한 고속 반송파 복원

  • 이철수 (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실) ;
  • 안재민 (충남대학교 전자전파정보통신공학과 이동멀티미디어통신 연구실)
  • Received : 2010.02.26
  • Accepted : 2010.04.12
  • Published : 2010.04.30
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Abstract

In this paper, we propose a new fast carrier recovery algorithm for high-order QAM systems. The proposed algorithm detects carrier frequency offset from the phase differences among the received symbols directly and combines it with the conventional carrier recovery, so that it is possible to achieve the carrier recovery with wide tracking range and fast acquisition time. Simulation results show that the proposed carrier recovery method reduces acquisition time at large frequency offset and low signal-to-noise ratio (SNR).

본 논문에서는 고차의 QAM 시스템을 위한 새로운 고속 반송파 복원 알고리즘을 제안한다. 제안된 방식은 수신 심볼 간 위상차를 이용하여 반송파 주파수 오프셋을 직접 검출하며, 이를 기존의 반송파 복원 방식에 적용함으로써 넓은 주파수 추적 범위와 빠른 수렴 속도를 제공하는 반송파 복원을 수행할 수 있다. 시뮬레이션을 통하여 제안된 반송파 복원 방식이 주파수 오프셋이 크고 신호 대 잡음비가 낮은 상황에서도 짧은 수렴 시간을 가지는 것을 확인하였다.

Keywords

References

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